docs: def overtime(self):
          """
          Returns an ``int`` of the number of overtimes that were played during
          the game, or an int constant if the game went to a shootout.
          """
          if self._overtime.lower() == 'ot':
              return 1
          if self._overtime.lower() == 'so':
              return SHOOTOUT
          if self._overtime == '':
              return 0
          num = re.findall(r'\d+', self._overtime)
          if len(num) > 0:
              return num[0]
          return 0